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File:I-80 Eastshore Fwy.jpg|thumb|350px|Interstate 80, seen here in Berkeley, California, is a freeway with many lanes and heavy traffic. '''Traffic''' on roads may consist of pedestrians, ridden or herded animals, vehicles, streetcars, buses and other Public conveyance|conveyances, either singly or together, while using the public way for purposes of travel. '''Traffic code|Traffic laws''' are the laws which govern traffic and regulate vehicles, while '''rules of the road''' are both the laws and the Norm (sociology)|informal rules that may have developed over time to facilitate the orderly and timely flow of traffic. Organized traffic generally has well-established priorities, lanes, Priority (right of way)|right-of-way, and traffic control at intersection (road)|intersections. Traffic is formally organized in many jurisdictions, with marked lanes, Junction...
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Automobiles 232
Crash injuries 85
Motor vehicles 67
Automobile industry and trade 43
Traffic accidents 41
Traffic safety 35
Traffic engineering 32
Traffic flow 28
Air bag restraint systems 26
Roads 26
Prohibition 24
Automobile parking 22
Transportation 21
Traffic signs and signals 19
Highway planning 18
Traffic safety and children 17
Traffic surveys 14
Parking garages 13
Crash injury research 12
Missouri 12
Parking lots 12
San Francisco (Calif.). Parking Authority 12
San Francisco (Calif.). Parking and Traffic Commission 12
state government publication 12
Trucks 11
Volkswagen automobiles 11
Alcool 10
Streets 10
Automobile drivers 9
Automobile supplies industry 9
Head 9
Taurus automobile 9
Temperance 9
Alcohol 8
Bicycle commuting 8
Bicycle parking 8
Bicycle trails 8
Chest 7
District of Columbia. Board of Commissioners 7
District of Columbia. Director of Traffic 7
Express highways 7
Liquor laws 7
Parking 7
Rabbit automobile 7
Road markings 7
Safety education 7
School children 7
Washington (D.C.) 7
Accidents 6
Automobile driver education 6
Electronic traffic controls 6
Local transit 6
Tempérance 6
public.resource.org 6
Corporations, International 5
North Carolina. Traffic Engineering Branch 5
Plastics in automobiles 5
Railroads 5
Railroads -- Periodicals 5
Railroads -- United States Periodicals 5
San Francisco (Calif.). Dept. of Parking and Traffic 5
Technology transfer 5
Traffic congestion 5
Alcohol in the body 4
Baltimore and Ohio Railroad Company 4
Caprice automobile 4
DRACR (Computer program) 4
Drinking and traffic accidents 4
Elevated highways 4
Escort automobile 4
Honda Civic automobile 4
Internal combustion engines, Spark ignition 4
Land use 4
Speed limits 4
System analysis 4
VEHSIM (Computer program) 4
Abdomen 3
Automobile driving 3
Bus lanes 3
Buses 3
CRASH III (Computer program) 3
Car pools 3
Celebrity automobile 3
Citation automobile 3
Databases 3
Daylight saving 3
Dominion Alliance for the Total Suppression of the Liquor Traffic 3
HEVSIM (Computer program) 3
MAXBAND (Computer program) 3
Middle Atlantic States -- Description and travel 3
Neck 3
Pelvis 3
Referendum 3
Selling 3
Solectria automobile 3
United States. National Highway Traffic Safety Administration 3
Vans 3
Automotive sensors 2
Average daily traffic 2
Breath tests 2
Chrysler LeBaron automobile 2
Communication and traffic 2
Crash sensors 2
Drinking age 2
Economic forecasting 2
Fees, Administrative 2
Grants-in-aid 2
Highway communications 2
INTRAS (Computer program) 2
Liquor traffic 2
Local option 2
Lois 2
MODOT 2
Older automobile drivers 2
Omega automobile 2
PAC (Computer program) 2
PSA 2
Panama-Pacific International Exposition (1915 : San Francisco, Calif.) 2
Pedestrians 2
Radar 2
Radar in speed limit enforcement 2
Roads - Great Britain 2
Sales forecasting 2
Street-railroads 2
Technological innovations 2
Traffic 2
Traffic Circulation 2
Traffic calming 2
Traffic noise 2
Traffic regulations 2
Traffic volume 2
Transport - Roads, Road Traffic 2
Transportation, Military 2
Transportation,Automotive - Great Britain 2
Trucking 2
Visibility 2
What -- Space Shuttle Orbiter 2
dot.gov 2
pickup trucks 2
1936 1
Acclaim automobile 1
Action games 1
Air Quality 1
Air quality 1
Air traffic control -- England London 1
Alcoholic beverage industry 1
Alcoholism and crime 1
Alcoolisme et criminalité 1
Ashkan Khatibi 1
Audi 5000 automobile 1
Automatic timers 1
Automobile driver education (Secondary) 1
Automobile driving in winter 1
Automobile repair fraud 1
Automobiles, Electric 1
Back Bay / Beacon Hill, Boston (Mass.) 1
Boissons alcoolisées 1
Borings 1
Brain 1
CAL-3D CVS (Computer program) 1
CRASH3 (Computer file) 1
California. University. Institute of Transportation and Traffic Engineering. Library 1
Camry automobile 1
Canada. Royal Commission on the Liquor Traffic 1
Carbon monoxide 1
Cavalier automobile 1
Censorship 1
Censure 1
Central Business District and Financial District, Boston (Mass.) 1
Challenger automobile 1
Charles Street, Boston (Mass.) 1
Chevette automobile 1
Child restraint systems in automobiles 1
Children's accidents 1
Chronology 1
Chrysler automobile 1
Commuters 1
Contracting 1
Cycling 1
DRAC (Computer program) 1
Development Projects 1
Dodge vans 1
Downtown, Boston (Mass.) 1
Drug abuse 1
Drugged driving 1
Drunk Driving 1
Drunk driving 1
Drunkenness (Crime) 1
Electronics in transportation 1
Emergency medical services 1
Enquêtes publiques 1
Environment (Aesthetics) 1
Ethanol -- pharmacology 1
Excel automobile 1
FedFlix 1
Federal aid 1
Federal aid to research 1
Fields Corner, Boston (Mass.) -- Parking Studies 1
Financial District, Boston (Mass.) 1
Ford trucks 1
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